Petr Velikiy is a heavy nuclear-powered missile cruiser , the fourth Kirov class battlecruiser of the Russian Navy, originally shipyard name Yuri Andropov. Although the ship is not a battlecruiser by the traditional definition of the type, but a missile cruiser, its size has given it the unofficial designation of a battlecruiser in the mass media of many countries. Petr Velikiy is the flagship of the Northern Fleet.